Oil burner



April 29, 1941. R. s. THORESEN OIL BURNER Filed Oct. 6, 1958 ATTORNEYS Patented Apr. 29, 1941 EFIQE .011. BURNER Ralph S. Thoresen, Darien, Conn, assignor to Petroleum Heat and Power Company, New York, N. Y., a. corporation of Delaware Application October 6, 1938, Serial No. 283,573

4 Claims.

This invention relates to an improvement in oil burners and in particular to circulation of the oil while preheating the same and before the oil is sent to the burner nozzle.

It has been customary in the past to circulate the oil from a supply tank through a pump and heaters and then back to the supply'tank again until the oil has attained the proper temperature for discharge .to the burner nozzle. This involves unnecessary piping and considerably increases the expense of installation.

More specifically, the present invention \provides an improved construction wherein the oil instead of being circulated through the heaters and back to the supply tank again is merely circulated through the heaters by a pump in a closed circuit until it is at the proper temperature and then it is sent to the burner nozzle.

In the accompanying drawing:

Fi 1 is an elevational view of an embodiment of my invention; and

Fig. 2 is a part sectional elevational View of the electrically controlled valve which controls the direction of flow of the oil.

Referring .to the drawing in detail: 2 designates the burner housing, Q the burner nozzle and 6 the oil pipe which leads from the rear of the burner housing to the burner nozzle. At the rear of the burner housing is mounted an electrically controlled valve, the housing of which is designated 8. The valve itself is designated ill in Fig. 2 and is adapted to control a port l2. The winding for the valve is designated I4, this winding being controlled by a thermostat I6.

l8 designates an oil circulating pump, the suction side of this pump being connected to a supply tank, not shown, by pipe line 20. Connected to the discharge side of the pump 18 is a steam heater 22 and an electric heater 24. These heaters, arranged in series, are connected by a pipe line 28 to a chamber 28. The thermostat I6 above referred .to extends into this chamber, as will be seen from Fig. 1.

Extending from the chamber 28 rearwardly of the burner housing is a pipe line 30. This line is in communication with port 32 and chamber 34 located above the valve 10.

The chamber 34 communicates by way of port 36 with passageway 38 in constant communication with pipe line 40. This line 40 extends forwardly of the burner housing to pressure valve 42 controlling the port 44 for the chamber 46, the latter being connected by a pipe line 48 to the line at the suction side of the Pump [8.

In operation the pump i3 draws oil from the supply tank and forces the same through the steam heater 22, electric heater 24 and pipe line 26 to the thermostat chamber 28. The oil passes out of this chamber by way of pipe line and port 32 to chamber 3 moving from thence by way of port 36, chamber38, pipe line 40, past the spring loaded pressure valve 42 to chamber 46 and by way of pipe line 48 directly back to the suction side of the pump 58 for recirculation. Accordingly the oil, until it has reached the desired temperature, is circulated in a closed circuit through the pump and heaters instead of being returned to the supply tank as is done in prior practice. As soon as the oil is heated to the temperature for which the thermostat i6 is set the thermostat will close the circuit for the winding 14 for the valve ill in a well understood manner, and the valve it will lift off its seat to open the port l2. The preheated oil entering the chamber 34 is now free to flow through the port I2 to the pipe line or tube 8 leading to the burner nozzle 4.

It will be appreciated that with the valve I0 open the pressure on the oil in port 44 will drop causing the spring loaded valve 42 to close thereby preventing oil from flowing through the pip-e line 48 to the suction side of the pump it.

It will be appreciated also that so long as the oil remains at the predetermined temperature for which the thermostat It has been set, valve Ill will remain open and the circulation just described will continue. However, upon a drop below the predetermined temperature the valve [0 will automatically close and the oil will then be recirculated through the pipe line 48, pump I8, heaters 22 and 24, etc. as above described.

It will be seen from all of the foregoing that the arrangement above described is extremely simple in construction and operation and provides for the elimination of the necessity for forcing the oil back to the supply tank while preheating. I1; will be appreciated, also, that the movement of the oil is controlled automatically and that oil will be supplied to the burner nozzle 4 only upon the oil attaining the temperature for which the thermostat is set.

What I claim is:

1. In combination an oil burner, a pump, conducting means for the oil, said pump drawing oil from a source of supply and forcing it through said conducting means to the burner, a heater in said conducting means for preheating the oil before it goes to the burner, a valve in said conducting means for the oil, said pump drawing oil from a source of supply and forcing it throughsaid conducting means to the burner, a heater in said conducting means at the pressure side of said pump, a thermostat in said conducting means and under the influence of the oil after it has passed through said heater, a valve in said conducting means' controlled by said thermostat for admitting the preheated oil to the burner after it has reached a predetermined temperature, conducting means connected to the suction side of the pump, and a valve in the last mentioned conducting means adapted to open when the thermostatically controlled valve is closed to permit of circulation of the oil from the pump through said heater and directly back to the pump.

3'. In combination an oil burner, a pump, oil conducting means, said pump drawing oil from a source of supply and forcing it to the burner, a heater for said oil located in said conducting means, a chamber having an inlet port and two outlet ports, one of said outlet ports being in communication with the nozzle of the oil burner, a valve for opening and closing said last mentioned port, the other of said outlet iports being in communication with the suction side of said pump, thermal means for opening said valve when the temperature 'of the oil has been raised by said heater to a predetermined amount to permit of a flow of oil through the first mentioned outlet port to the oil burner nozzle, said valve closing upon a predetermined drop in the temperature of the oil, oil conducting means leading from the second mentioned outlet port to the suction side of the pump, and a spring loaded valve in said last mentioned oil conducting means for opening and closing said port upon an increase and decrease in pressure, respectively, on the oil due to the position of the thermally con trolled valve whereby when the oil is at a predetermined temperature it will flow to the burner nozzle, and when below that temperature it will .by-pass the burner nozzle and flow direct to the suction side of said pump to be recirculated through the heater.

4. In combination an oil burner, a pump, oil conducting means, said pump drawing oil from a source of sup-ply and forcing it to the burner, a heater for said oil in said oil conducting means, a chamber having an inlet port and two outlet ports, one of said outlet ports being in communication withthe nozzle of the oil burner, an electrically operated valve for opening and closing the said last mentioned port, the other of said outlet ports being in' communication through oil conducting means with the suction side of said pump, thermal means for controlling said electrically operated valve whereby said valve will open upon a predetermined increase in the temperature of the oil to permit of a flow of oil through the first mentioned outlet port to the oil burner nozzle, a spring loaded valve in the last mentioned oil conducting means actuated upon a drop" in pressure due tothe flow of oil to the burner nozzle to prevent the flow of oil to said pump, said electrically operated valve closing upon a predetermined drop in the temperature of the oil to prevent oil passing to the burner, resulting in increase in pressure in the oil opening said spring-loaded valve thereby to permit the oil to flow to the suction side of the pump for recirculation through said heater.

RALPH S. THGRESEN. 

